Process of making lead-copper-tin compositions.



.UNITED srxrrns PATENT OFFICE.

EDWARD I). GLEASON, OF NEW YORK, N. Y., ASSIGNOR TO PLASTIC METAIi COMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK;

rnocnss or MAKING Lnnn-corrnn-rm comrosrrrons.

Specification of Letters Patent. I

Patented Nov. 4, 1913.

No Drawing. Original application flied March 7, 1913, Serial No. 752,600. Divided and this application flied April 4, 1918. Serial No. 758,838.

To all whom/it may concern:

Be it known that I, .EDWARD D. GLEASON,

a citizen of the United States, residing in Brooklyn, in the county of Kings, city and State of New York, have'invented a certain new and useful Improvement in Processes of Makin Lead-Copper-Tin Compositions, whereof t e following is a specification.

This application is a division of my aplication' Serial 7 52,600, filed March 7, 1913,

improvement in lead-copper-tin compositions.

My invention relates to plastic compositions including lead-copper and tin, which may be advantageously used in the manufacture of bearings forshafts,'etc. 1

It is an object of my invention to provide such compositions free from lead sweats and segregatiomwhich are defects usually found in such compositions due to lack of aflinity of the lead for? the co per or copper and tin, and the hi h s eci c gravity and low melting point 0 lea ,-for, at best, such compositions are but mechanical mixtures wherein copper is held in a finely divided state in a matrix of lead. a

Another object of my invention is to provide such compositions includin a given percentage of copper but of di erent degrees of hardness. Y

The eifect of my improvement is to provide a composition which is homogeneous in that the copper therein is comminuted to the greatest possible extent and equally distributed throughout the mass of the composition. I have discovered that the effect aforesaid is attained by fusing with the composition a non metallic derivative of one of the composition metals capable of increasing its miscibility, for instance, by adding sulfid to the molten copper in the process of making such com ositions, particularly the native lead s'ulfi galena. For instance, I fuse 60 pounds of copper and addthereto 5 pounds of galena and then gradually add,

to said mixture, 30 pounds of lead and 5- pounds of tin. The fused mixture is then poured into ig, ingot or other suitable molds, and, w an congealed, fracture thereof shows that the cast metal is homogeneous.

It may be observed that such a mixture, without the galena, forms castings in which the tin is segregated forming strata. In other words, fusion with a non-metallic derlvative of the other metal, to wit, lead sulfid, increases the miscibility of tin with that metal, and with the other metals of the composition, so that the latter isthus rendered homogeneous as described.

- Compositions of copper and lead, without tin, form the subject matter of my application Serial 752,601, filed March 7 1913, for Letters Patent of the United States.

I do not desire to limit myself to the precise methods of procedure or proportions herein set forth as it is obvious that various modifications .may be made therein without departing from my invention as defined in the appended claims.

I claim 1. A process of making a-composition of copper, lead and tin which consists in fusing sald metals with .lead sulfid and thereby increasing the miscibility of said metals.

2. A process of makin a com osition which consists in fusing lead copper and then adding lead and tin thereto and fusing the mixture.

3. -A process of making a composition containing tin and another metal, which consists infusing therewith a non-metallic desul d' with creasing the miscibility of tin with that metal.

4. A process of making a composition containing tin and another metal which consists in, fusing therewith a sulfid of the other metal, capable of increasing the miscibility of' tin with that metal.

5. A process of makin a com osition of copper, lead and tin, which consists in fusing said metals with anon-metallic derivative of one of them, capable of increasing the miscibility of said metals. In testimony whereof, I have hereunto signed my name at Brooklyn, New York, this first day of April 1913.

, EDWARD D, GLEASON. Witnesses:

BENJAMIN ZEKOWSKI,

TONY Znxowsin. 

